Classic ASP

Get the Certificate Used for Decryption

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

After a successful decryption, LastDecryptCert loads the certificate(s) actually used into a Cert object, indexed from zero up to NumDecryptCerts minus one.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background. Following decryption or security unwrapping, Chilkat records which certificate(s) were used. LastDecryptCert retrieves them so the application can report or verify the identity involved.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

set mime = Server.CreateObject("Chilkat.Mime")
success = mime.LoadMimeFile("qa_data/encrypted.eml")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

'  Configure a decryption source and decrypt.
pfxPassword = "myPfxPassword"
success = mime.AddPfxSourceFile("qa_data/recipient.pfx",pfxPassword)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

success = mime.Decrypt()
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

'  After a successful decryption, load the certificate(s) that were used.  The 1st argument is the
'  zero-based index and the 2nd is a Cert that receives the certificate.
n = mime.NumDecryptCerts
set cert = Server.CreateObject("Chilkat.Cert")

For i = 0 To n - 1
    success = mime.LastDecryptCert(i,cert)
    If (success = 0) Then
        Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
        Response.End
    End If

    Response.Write "<pre>" & Server.HTMLEncode( "Decrypted with: " & cert.SubjectCN) & "</pre>"
Next

%>
</body>
</html>